You Have Been Asked to Modify the Nozzle of a Rocket

question 23

Multiple Choice

You have been asked to modify the nozzle of a rocket engine. The existing rocket produces a laminar flow of exhaust gasses, but is not powerful enough to lift a new generation of communication satellites. You have been asked to advise on the best way to increase the thrust without causing the flow to become turbulent. The rocket thrust is proportional to the density of the exhaust, to its velocity, and to the square of the nozzle diameter. What is the best approach?

• A) Increase the diameter of the nozzle and decrease the velocity by the same factor.
• B) Increase the density of the exhaust and decrease the velocity by the same factor.
• C) Increase the velocity of the exhaust and decrease the diameter of the nozzle by the same factor.
• D) All the other proposed solutions are feasible.
• E) None of the other proposed solutions are feasible.ANS

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